H - Electricity – 01 – J
Patent
H - Electricity
01
J
31/123, 313/136
H01J 61/35 (2006.01) C09K 11/77 (2006.01) H01J 61/44 (2006.01) H01J 61/46 (2006.01)
Patent
CA 1211781
ABSTRACT OF THE DISCLOSURE The present invention is a green-emitting phosphor and a low pressure mercury vapor discharge lamp using this phosphor. This phosphor has a monoclinic monazite-type crystal structure and comprises a phosphate of cerium, terbium, and possibly lanthanum. It is significantly different from green-emitting phosphors of the prior art in that it further comprises at least one element selected from the alkali metals, fluorine, indium, and boron. Because of the addition of these elements, the decrease in powder brightness of the present phosphor after heating in air at 600 °C (the temperature at which phosphors are heated during the baking step of lamp manufacture) is much less than for conventional green-emitting phosphors. The decrease in brightness of the present phosphor after irradiation by ultraviolet light at 185 nm is also much less than for conventional phosphors. It is accordingly most appropriate for use in discharge lamps. The low pressure mercury vapor discharge lamp using the present phosphor is of high efficiency and has high color rendition.
433100
Ito Hiroshi
Murakami Katsuo
Tanaka Norihiko
Umeda Saburo
Yamazaki Hitoshi
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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